By Al Stevens
Research the basics of making and utilizing item orientated databases with C++ Database improvement, 2d variation . This finished advisor covers the heritage and ideas of database administration, complicated innovations for designing and writing C++ continual item database courses, and utilizing PARODY the power, Almost-Relational item Database supervisor. C++ Database improvement, second variation additionally features a bonus diskette with resource code for PARODY and the entire examples from the publication.
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Extra resources for C++ Database Development
They define different levels of support that C++ provides for class design. 5 shows three methods added to the Date class. 5 illustrate three typical method variants. The first method tells the object to do something, in this case to display itself. The class's implementation knows how to display the object's data representation. The programmer who uses the class is unconcerned about the details of the implementation. The second method tells the object to change itself, in this case to adjust its month data value up or down the number that is specified in the method's parameter.
When you code an expression in which the compiler expects to see something other than what you provide as just described, the compiler executes one of your implicit conversion methods to convert the data type. This is an example of a method that you do not explicitly call (or send a message to) from within your program. It executes as the result of the implicit call inferred by the compiler during its interpretation of your expression. Your program implies a call to the method by the context in which it uses data types in an expression.
When the class has derived classes and when those derived classes override the virtual functions, the compiler puts the overriding function addresses in the vtbl. The C++ language supports polymorphism by calling virtual functions through these tables. 5 cannot work some of the time. If the program writes the full contents of the object to a disk file, the image includes the vptr. If another program instantiates the object and if the base class reads its image from the database, the image writes an old, incorrect value over the new 49 50 C++ Database Development program's vptr for the object.
C++ Database Development by Al Stevens